'Extend all loans' for a patron in the back office (librarian)

[salomerohr]

Is your feature request related to a problem? Please describe.
As a librarian, in the back office, if a patron a several loans and would like to extend them all, we have to click on each loan and extend them one by one.

Describe the solution you'd like
A button "Extend all loans' on patron's profile as it is the case for patron in the front office where they can themselves extend all their loans at once.

[kpsherva]

disable, not hide the extend the all loans